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BangleApps/apps/arrow/app.js

180 lines
4.8 KiB
JavaScript

var pal1color = new Uint16Array([0x0000,0xFFC0],0,1);
var pal2color = new Uint16Array([0x0000,0xffff],0,1);
var buf1 = Graphics.createArrayBuffer(160,160,1,{msb:true});
var buf2 = Graphics.createArrayBuffer(80,40,1,{msb:true});
var img = require("heatshrink").decompress(atob("lEowIPMjAEDngEDvwED/4DCgP/wAEBgf/4AEBg//8AEBh//+AEBj///AEBn///gEBv///wmCAAImCAAIoBFggE/AkaaEABo="));
var bearing=0; // always point north
var heading = 0;
var candraw = false;
var CALIBDATA = require("Storage").readJSON("magnav.json",1)||null;
Bangle.setLCDTimeout(30);
function flip1(x,y) {
g.drawImage({width:160,height:160,bpp:1,buffer:buf1.buffer, palette:pal1color},x,y);
buf1.clear();
}
function flip2(x,y) {
g.drawImage({width:80,height:40,bpp:1,buffer:buf2.buffer, palette:pal2color},x,y);
buf2.clear();
}
function radians(d) {
return (d*Math.PI) / 180;
}
function drawCompass(course) {
if(!candraw) return;
buf1.setColor(1);
buf1.fillCircle(80,80,79,79);
buf1.setColor(0);
buf1.fillCircle(80,80,69,69);
buf1.setColor(1);
buf1.drawImage(img, 80, 80, {scale:3, rotate:radians(course)} );
flip1(40, 30);
}
function newHeading(m,h){
var s = Math.abs(m - h);
var delta = (m>h)?1:-1;
if (s>=180){s=360-s; delta = -delta;}
if (s<2) return h;
var hd = h + delta*(1 + Math.round(s/5));
if (hd<0) hd+=360;
if (hd>360)hd-= 360;
return hd;
}
function tiltfixread(O,S){
var start = Date.now();
var m = Bangle.getCompass();
var g = Bangle.getAccel();
m.dx =(m.x-O.x)*S.x; m.dy=(m.y-O.y)*S.y; m.dz=(m.z-O.z)*S.z;
var d = Math.atan2(-m.dx,m.dy)*180/Math.PI;
if (d<0) d+=360;
var phi = Math.atan(-g.x/-g.z);
var cosphi = Math.cos(phi), sinphi = Math.sin(phi);
var theta = Math.atan(-g.y/(-g.x*sinphi-g.z*cosphi));
var costheta = Math.cos(theta), sintheta = Math.sin(theta);
var xh = m.dy*costheta + m.dx*sinphi*sintheta + m.dz*cosphi*sintheta;
var yh = m.dz*sinphi - m.dx*cosphi;
var psi = Math.atan2(yh,xh)*180/Math.PI;
if (psi<0) psi+=360;
return psi;
}
// Note actual mag is 360-m, error in firmware
function reading() {
var d = tiltfixread(CALIBDATA.offset,CALIBDATA.scale);
heading = newHeading(d,heading);
var dir = bearing - heading;
if (dir < 0) dir += 360;
if (dir > 360) dir -= 360;
drawCompass(dir); // we want compass to show us where to go
buf2.setColor(1);
buf2.setFontAlign(-1,-1);
buf2.setFont("Vector",38);
var course = Math.round(heading);
var cs = course.toString();
cs = course<10?"00"+cs : course<100 ?"0"+cs : cs;
buf2.drawString(cs,0,0);
flip2(90, 200);
}
function calibrate(){
var max={x:-32000, y:-32000, z:-32000},
min={x:32000, y:32000, z:32000};
var ref = setInterval(()=>{
var m = Bangle.getCompass();
max.x = m.x>max.x?m.x:max.x;
max.y = m.y>max.y?m.y:max.y;
max.z = m.z>max.z?m.z:max.z;
min.x = m.x<min.x?m.x:min.x;
min.y = m.y<min.y?m.y:min.y;
min.z = m.z<min.z?m.z:min.z;
}, 100);
return new Promise((resolve) => {
setTimeout(()=>{
if(ref) clearInterval(ref);
var offset = {x:(max.x+min.x)/2,y:(max.y+min.y)/2,z:(max.z+min.z)/2};
var delta = {x:(max.x-min.x)/2,y:(max.y-min.y)/2,z:(max.z-min.z)/2};
var avg = (delta.x+delta.y+delta.z)/3;
var scale = {x:avg/delta.x, y:avg/delta.y, z:avg/delta.z};
resolve({offset:offset,scale:scale});
},30000);
});
}
function docalibrate(e,first){
const title = "Calibrate";
const msg = "takes 30 seconds";
function action(b){
if (b) {
buf1.setColor(1);
buf1.setFont("Vector", 30);
buf1.setFontAlign(0,-1);
buf1.drawString("Figure 8s",80, 40);
buf1.drawString("to",80, 80);
buf1.drawString("Calibrate",80, 120);
flip1(40,40);
calibrate().then((r)=>{
require("Storage").write("magnav.json",r);
Bangle.buzz();
CALIBDATA = r;
startdraw();
setButtons();
});
} else {
startdraw();
setTimeout(setButtons,1000);
}
}
if (first===undefined) first=false;
stopdraw();
clearWatch();
if (first)
E.showAlert(msg,title).then(action.bind(null,true));
else
E.showPrompt(msg,{title:title,buttons:{"Start":true,"Cancel":false}}).then(action);
}
var intervalRef;
function startdraw(){
g.clear();
g.setColor(1,1,1);
Bangle.drawWidgets();
candraw = true;
intervalRef = setInterval(reading,200);
}
function stopdraw() {
candraw=false;
if(intervalRef) {clearInterval(intervalRef);}
}
function setButtons(){
setWatch(()=>{load();}, BTN1, {repeat:false,edge:"falling"});
setWatch(Bangle.showLauncher, BTN2, {repeat:false,edge:"falling"});
setWatch(docalibrate, BTN3, {repeat:false,edge:"falling"});
}
Bangle.on('lcdPower',function(on) {
if (on) {
startdraw();
} else {
stopdraw();
}
});
Bangle.on('kill',()=>{Bangle.setCompassPower(0);});
Bangle.loadWidgets();
Bangle.setCompassPower(1);
startdraw();
setButtons();